The Pension Benefit Guaranty Corporation says multi-employer plans, which are collectively bargained retirement plans maintained by more than one employer, are most at risk.

At the same time, the agency says single-employer pension plans - covering a little more than 30 million participants - are on firmer financial footing and are likely to remain so at least over the next 10 years.

The report says as shaky as the situation is for underfunded multi-employer plans, the outlook is slightly better than it was just a year ago as the nation's economy gradually improves from the severe 2007-2009 recession.

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